Public mobilisation is needed to enact obesity prevention policies and to mitigate backlash against their implementation. However, current approaches in public health focus primarily on dialogue between public health professionals and political leaders. Strategies to increase popular demand for obesity prevention policies include refining and streamlining public information, identifying effective frames for each population, enhancing media advocacy, building citizen protest and engagement, and developing a receptive political environment with change agents embedded across organisations and sectors. Long-term support and investment in collaboration among diverse stakeholders to create shared value is also important. Each actor in an expanded coalition for obesity prevention can make specific contributions to engaging, mobilising and coalescing the public. Shifting from a top-down to an integrated bottom-up and top-down approach would require an overhaul of current strategies and re-prioritisation of resources.